S&S Cycle Super Stock Big Twin Alternator Style Crankcase - Natural, 3-5/8 Bore 31-0077 price


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List Price: $1,108.95
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Machined to just accept the stock oil filter assembly introduced on some 1992 model Big Twins. This convenient, accessible location could be utilized to simplify installation of an oil filter in custom applications
Machined to just accept 81-99 or 92-99 style oil pumps and are machined to the stock 81-99 style oil distribution system
For Evolution style engines, the engine builder gets the option of venting the crankcase breather from your crankcase, from the cylinder heads, or both. Its recommended using both crankcase breathers in engines of 96 or larger displacement. To get this to possible in every applications, there are 2 crankcase breather holes available within the rear of S&S alternator crankcases. One is inside the stock location and the opposite is angled into enable the installation of a crankcase breather fitting in chassis with integral transmission/oil tank
S&S Big Twin cases optimize crankcase oil scavenging efficiency by using a ported design breather passageway along with a breather window which is machined to maximum timing specifications. These features enable the air/oil mist to move smoothly from your flywheel cavity to the gear chest of the engine
The return oil pick-up passage towards the return side of the oil pump continues to be relocated to be able to stop the turbulence caused from the oil pump drive gear. This unique design brings about greatly improved scavenging of oil in the gear case and virtually eliminates oil carry over at sustained high speeds. S&S Big Twin crankcases for Evolution style engines are not machined using a primary oil scavenge port for drawing oil from the Shovel style primary chain case. If your primary oil scavenge port is needed by using an Evolution style crankcase, it can be special ordered
92-99 Evolution Big Twin Models
Available stock bore or 3-5/8 bore and natural aluminum or black powder-coated finish
Accepts 92-99 style oil pumps
92-99 cases differ in the 84-91 only in the oil pump mounting bolt pattern



Product Features
Machined to accept the stock oil filter assembly introduced on some 1992 model Big Twins. This convenient, accessible location can be utilized to simplify installation of an oil filter in custom applications
Machined to accept 81-99 or 92-99 style oil pumps and are machined for the stock 81-99 style oil distribution system
S&S Big Twin cases optimize crankcase oil scavenging efficiency by using a ported design breather passageway and a breather window that is machined to maximum timing specifications. These features allow the air/oil mist to move smoothly from the flywheel cavity to the gear chest of the engine
For Evolution style engines, the engine builder has the option of venting the crankcase breather from the crankcase, through the cylinder heads, or both. Its recommended using both crankcase breathers in engines of 96 or larger displacement. To make this possible in all applications, there are 2 crankcase breather holes available in the rear of S&S alternator crankcases. One is in the stock location and the other is angled down to allow the installation of a crankcase breather fitting in chassis
The return oil pick-up passage to the return side of the oil pump has been relocated in order to avoid the turbulence caused by the oil pump drive gear. This unique design results in greatly improved scavenging of oil from the gear case and virtually eliminates oil carry over at sustained high speeds. S&S Big Twin crankcases for Evolution style engines are not machined with a primary oil scavenge port for drawing oil from a Shovel style primary chain case. If the primary oil scavenge port is req




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